Development and Mechanical Properties of Compacted Graphite Cast Iron (CGI) Suitable for Exhaust System Pipes

This research focuses on the development of compacted graphite iron (CGI) and evaluating its mechanical properties for application in exhaust system components. Theoretical and practical failure analysis were carried out on selected exhaust system parts and. CGI with varying microstructures was produce. Six different types of CGI term C1 to C6 were produced, incorporating alloying elements such as chromium, aluminum, copper, titanium and nickel in micro amounts of about 0.1%- 0.5%. The study also investigated the mechanical properties of CGI, including tensile strength, hardness, and impact resistance, aiming to understand the material's behavior under relevant conditions. Optical microscope was carried out on the produce CGI to check their microstructure. The results from the micrograph shows that CGI of varying microstructure was produce. The results from the mechanical tests show that C4 has the optimum values of 1.5 MPa for tensile strength, 6.15% for ductility, 204 Brinell hardness value and 35.9J/mm2 for impact strength. By analyzing these properties, the study provides valuable insights into the performance and durability of CGI for the production of exhaust system pipes, aiding in the design and selection process for automotive applications.